Goatsbeard plant named ‘Misty Lace’

ABSTRACT

A Goatsbeard Plant named ‘Misty Lace’ is a hybrid between  Aruncus dioicus  and  Aruncus aethusifolius,  and bears distinct habit, having perfect flowers that are borne in feathery, elongate terminal panicles.

Botanical description: Aruncus dioicus×Aruncus aethusifolius Hybrid named ‘Misty Lace’.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention comprises a new and distinct plant of Aruncus, which has been given the name ‘Misty Lace’. The plant is a hybrid between Aruncus dioicus and Aruncus aethusifolius, and bears distinct habit and floral characteristics which differentiate it from existing cultivars. A number of plants which appeared to be hybrids resulting from open pollination of unnamed species plants growing in the proximity were identified by the inventors in 1999 in Monkton, Md., in the garden of Richard Simon. Three plants were selected by the inventors and taken back to the University of Georgia, Athens, Ga. for subsequent morphological description and evaluation under Southeastern environmental conditions. Of the three evaluated for heat tolerance, only one plant remained alive and thrived and this single plant was identified as the new cultivar. The plant will be used primarily as an ornamental perennial. Asexual reproduction of Aruncus ‘Misty Lace’ has been successfully accomplished through tissue culture protocol, developed by Dr. Wetzstein at the University of Georgia. This is the only means known to the inventors to rapidly reproduce this cultivar for commercial introduction. The instant plant has been consistently produced true to type from tissue culture.

2) Description of Relevant Prior Art

Goatsbeard, the common name for the genus, Aruncus, is a well-known genus in ornamental horticulture. Presently, the most common species available commercially is the 1.2-1.8 m common goatsbeard, A. dioicus, followed by the dwarf 0.2-0.3 m tall Korean goatsbeard, A. aethusifolius. The invention is a hybrid between the two, with a plant height of 0.3-0.5 m. ‘Misty Lace’ is distinguished from all other varieties of Aruncus known to the inventors by its plant and leaf size.

SUMMARY OF THE INVENTION

Aruncus ‘Misty Lace’ is a hybrid between A. dioicus and A. aethusifolius, with intermediate plant and leaf size.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying illustration shows characteristics of the new cultivar in a photograph as true to color as is reasonably possible to make in illustrations of this nature.

FIG. 1 shows the habit and flowers of a typical 1 year old specimen growing in the University of Georgia Trial Gardens in Athens, Ga.

BOTANICAL DESCRIPTION OF THE PLANT

This plant is a rhizomatous herbaceous perennial species that generally grows 30-50 cm tall at maturity in Georgia. It is a hybrid between the 2 species, A. aethusifolius and A. dioicus and is distinguished by having an intermediate habit between the two, although it favors A. aethusifolius in height. The following description defines the overall appearance of one year old plants as grown under normal conditions in The University of Georgia Horticultural Trial Gardens in Athens, Ga., U.S.A. (USDA Zone 7b). The summers are hot and humid ranging from 75-100 F. (24-38 C.) the average being ˜85 F. (29 C.), and winters with average day temperatures of approximately 40 F. (4 C.) Colors are based on The Royal Horticultural Color Chart (1995).

-   Plant: The plant is conical to pyramidal with an upright habit, and     is 30-50 cm high and 30-50 cm in diameter. -   Stems: The plants have rounded stems, averaging 25.4 cm in length     and 3-5 mm in diameter, above which is the terminal peduncle, the     flower stem. The internode length varies from 3.8-5.1 cm and the     color is RHS 145A during the early spring, and RHS 137A during the     summer months. -   Leaf: Leaves occur basally and on the stem and are approximately     12-16 cm long and up to 15 cm wide at their furthest point. Leaflets     are doubly serrate in margin with an acuminate apex and rounded base     and a glabrous upper and lower surface. The leaflets themselves     range from 2-4 cm in length and 2-3 cm in width. The colors of the     upper and lower surfaces of the leaves are RHS 137 A and RHS 137C,     respectively. Leaves are arranged alternately and are bi- to     tri-pinnately compound with one ovate terminal leaflet and 3-4 pairs     of pinnately arranged side leaflets. The leaves are petiolate with     the petiole being on average 6 cm long with the terminal leaflet and     the first side pair being sessile or essentially sessile, with     petiole less than 0.5 cm. The remaining 2-3 leaflet pairs are     petiolate with the petiole being 0.5 cm on the second side pair and     1-2 cm on the remaining 1-2 side pairs. Table 1 presents a     comparison of leaf and plant measurements and flower color among     ‘Misty Lace’ and its parent species, A. aethusifolius and A.     dioicus.

TABLE 1 Average leaf size, plant height and flower color for selected Aruncus species Leaf Height of Length Leaf Width Mature Plant Color of Flower (cm) (cm) (cm) RHS A. ‘Misty Lace’ 14 13 30-50 155A A. aethusifolius 10 9 20-40 155C A. dioicus 90 75 122-182 155D

-   Inflorescense: Flowers are perfect and are borne in feathery,     elongate terminal and axillary panicles. All flowers in the     inflorescence are similar in size and color, with the peduncle     averaging 2-4 cm in length and 1 cm diameter. The color of the     peduncle is RHS 137A. The mature terminal inflorescences are     approximately 18 cm in length and 1.3 cm in diameter, and contain     approximately 250 flowers per panicle. The axillary inflorescences     are approximately 10 cm in length, 1.3 cm in diameter, and consist     of approximately 35 flowers.

The corolla is campanulate in shape with a diameter of 3-4 mm, and contains 5 petals which are spatulate in shape, 1-2 mm in length, and 2-3 mm wide with an obtuse apex, oval base and entire margin. The color of both surfaces is RHS 155 A.

There are 5 sepals, which are 1 mm in length and less than 1 mm in width, ovate in shape with acuminate apex, oval base and entire margin. The color is RHS 143 A.

The flower contains 3 pistils which are 2-3 mm in length and the 3 stigmas are RHS 155 B in color. There are 15 to 20 anthers, 2-3 mm in length and RHS 155 A in color. The pollen has not been characterized.

The buds are oval in shape, 1 to 2 cms in length, and 0.5 cm in diameter, with a color of RHS 145 A and RHS 179 A tips.

-   -   -   Timing.—Flowers are produced in mid and late spring,             May-June in Athens, Ga. Plants, which were grown in 4 inch             (10 cm) containers, were placed in the Horticulture Trial             Garden at the University of Georgia in the spring of 2001.             After one winter, plants averaged four stems with three             inflorescences each. At the end of the second and subsequent             winters, plants averaged 8 stems with 4-6 inflorescences             each. Individual flowers and inflorescence last from 5 to 10             days depending on the weather conditions. The plant carries             inflorescences for up to 5 weeks depending on the weather             conditions.         -   Fragrance.—None.         -   Seed.—Seed has been observed, 1 to 3 per ovary, but             viability is unknown, although no seedlings have ever been             observed by the inventors. The seed is caudate in shape with             a reticulated seed coat, about 2 mm in length with a color             of RHS 165A.

-   Other characteristics: The plant has been observed for four years in     Athens, Ga. and has thrived in the heat and humidity in the garden.     In general, Aruncus do poorly under such conditions, but this plant     has been perfectly adaptable to at least USDA zone 7b conditions.     Also, in 2002-2003, plants were trailed at the University of Georgia     Blairsville Research Station, the University of Florida,     Gainesville, Fla., the JC Raulston Arboretum, Raleigh, N.C., the     Chicago Botanic Garden, the University of Maine, Orono, Me., and the     Ulbrich Botanic Garden, Madison Wis. In all cases except     Gainesville, Fla., plants survived the winter of 2002 and flowered     in the spring of 2003.

-   Disease/pest resistance: No specific disease or pests of the instant     plant have been observed by the inventors under the conditions under     which the plant has been grown in Athens. 

1. A new and distinct Aruncus plant, as herein shown and described. 